Lubricants Test – 2

1. If the viscosity must not be ________ to a liquid oil film between two moving liquid.

2. The viscosity of the lubricating oil must be sufficient to keep it in position.

3. The viscosity of an oil decrease when temperature ________

4. For machines operating at the high speed and low pressure __________ are used.

5. The viscosity of the oil changes rapidly with the change in temperature has _______

6. ________ is used in machines operating at high pressure and slow speeds.

7. Viscosity means the flow of the liquid is resisted by ________

8. The rate of change of the viscosity with raise in temperature is measured by an arbitrary scale called as _________

9. Excessive friction takes place, when the viscosity is ________

10. Addition of linear polymers to the increases the V.I and oils with V.I higher than _______ are prepared.

11. Mathematically, viscosity index can be given by __________